Granted Patent
Utility
US 6,209,542 · App. 08/594,904
Combination face mask and dental device for improved breathing during sleep
Inventor:
W. Keith Thornton
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Jan 31, 1996
Inventor
W. Keith Thornton
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.